USD POLL : Which lesser-known fact about The Exorcist surprised you the most?
The voice of the demon, dubbed by Mercedes McCambridge, required a special credit due to the intense process of creating it.
Linda Blair, who played Regan, was only 14 years old during filming and required special permission to do some of the more intense scenes.
The filmmakers used a "subliminal editing" technique to insert scary images into the film, such as the demon's face.
The film's director, William Friedkin, had the set blessed by a Catholic priest before filming began.
Ellen Burstyn, who played Regan's mother, suffered a real-life injury during a stunt on set, which was included in the film.
The film was the first horror movie to be nominated for an Academy Award for Best Picture.
The opening sequence with Father Merrin in Iraq was shot last, but appears at the beginning of the film.
The demon's name is never explicitly stated in the film, but is widely believed to be Pazuzu.
The special effects team created a unique blend of pea soup, oatmeal, and green food coloring for the vomiting scenes.
The film faced numerous controversies and bans due to its explicit content and religious themes.
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